Glycine Betaine Experiment

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Plant growth parameters
As shown in Fig. 1, increasing NaCl concentrations significantly reduced the growth traits (plant length, number of leaves, fresh and dry weights of shoots and roots, and leaf area) of cucumber plants to reach their lowest values at 100 mM of NaCl, compared to the non-salt-stressed control. Under non-saline conditions, foliar application of salicylic acid or proline significantly enhanced the above mentioned parameters compared with water-sprayed plants and no significant difference was shown between glycine betaine and water sprayings. Under 50 mM NaCl stress, exogenous applications of salicylic acid, proline, or glycine betaine mitigated significantly the negative effects of NaCl salt on these parameters. However, there were no significant differences between plants sprayed with glycine betaine or water under 100 mM of NaCl. Salicylic acid was the most effective in alleviating the negative effects of the salt stress followed by proline and by glycine betaine.
Chlorophyll content …show more content…

2). Under non-saline conditions, salicylic acid, proline, or glycine betaine significantly enhanced chlorophyll contents compared to the water-sprayed plants. The highest significant values were obtained with salicylic acid followed by proline. Under NaCl stresses, foliar applications of salicylic acid, proline, or glycine betaine ameliorated the adverse effects of NaCl salt on chlorophyll (a, b and total) contents. Salicylic acid was the most effective in ameliorating the adverse effects of NaCl stress followed by proline and by glycine

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